I highly reccomend against opening your Power supply, not only could you kill yourself from the AMPs within it even if it is off and dissconnected. But you could also damage the internal Parts of the PSU if you do something wrong. Another thing is the fans in a PSU are ment to cool the PSU internal components powering you system, so discconnecting the fan would be a bad idea.

I can't really help you, I just wanted to point out that Opening a PSU is a really bad Idea.

As for me opening up power supplies, I've been known for doing stupid things. Must be in my genes or something. I've been hit by a car twice. Had my head slammed between a car door. Drop-kicked off a fence. Fallen off a bicycle with no brakes going 40-clicks through a rocky trail. Et cetera. =)